diff --git a/recipe/activate-clang-cl_win-64.bat b/recipe/activate-clang-cl_win-64.bat
index 13b39c7..05a1222 100644
--- a/recipe/activate-clang-cl_win-64.bat
+++ b/recipe/activate-clang-cl_win-64.bat
@@ -8,6 +8,6 @@ set "AR=llvm-ar.exe"
 set "RANLIB=llvm-ranlib.exe"
 
 set "CPPFLAGS_USED=-D_CRT_SECURE_NO_WARNINGS -fms-runtime-lib=dll -fuse-ld=lld"
-set "LDFLAGS=/link /DEFAULTLIB:%CONDA_PREFIX%\lib\clang\@MAJOR_VER@\lib\windows\clang_rt.builtins-x86_64.lib"
+set "LDFLAGS=/DEFAULTLIB:%CONDA_PREFIX%\lib\clang\@MAJOR_VER@\lib\windows\clang_rt.builtins-x86_64.lib"
 set "CFLAGS=@CFLAGS@ %CPPFLAGS_USED%"
 set "CXXFLAGS=@CXXFLAGS@ /std:c++17 %CPPFLAGS_USED%"
diff --git a/recipe/cmake_test_c/CMakeLists.txt b/recipe/cmake_test_c/CMakeLists.txt
new file mode 100644
index 0000000..f7bf73c
--- /dev/null
+++ b/recipe/cmake_test_c/CMakeLists.txt
@@ -0,0 +1,2 @@
+cmake_minimum_required(VERSION 3.12)
+project(cf_dummy LANGUAGES C)
diff --git a/recipe/cmake_test_cxx/CMakeLists.txt b/recipe/cmake_test_cxx/CMakeLists.txt
new file mode 100644
index 0000000..b1a5a1a
--- /dev/null
+++ b/recipe/cmake_test_cxx/CMakeLists.txt
@@ -0,0 +1,2 @@
+cmake_minimum_required(VERSION 3.12)
+project(cf_dummy LANGUAGES CXX)
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index afce942..1b2940f 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -7,7 +7,7 @@
 {% set cl_minor = CL_VERSION.split(".")[1] %}
 {% set vc_major = VCVER.split(".")[0] %}
 
-{% set build_number = 19 %}
+{% set build_number = 20 %}
 
 # separate builds number for headers & winsdk; reset when version increases (resp. all relevant versions)
 {% set headers_build_number = 5 %}
@@ -111,7 +111,11 @@ outputs:
         - clang_impl_{{ target_platform }}         # [osx]
         - gcc_impl_{{ target_platform }}           # [linux]
     test:
+      requires:
+        - cmake
+        - ninja
       files:
+        - cmake_test_c/
         - test.c
         - run_test_clang.sh   # [not win]
         - run_test_clang.bat  # [win]
@@ -143,7 +147,11 @@ outputs:
         - clangxx_impl_{{ target_platform }}        # [osx]
         - gxx_impl_{{ target_platform }}            # [linux]
     test:
+      requires:
+        - cmake
+        - ninja
       files:
+        - cmake_test_cxx/
         - test.cpp
         - run_test_clangxx.sh       # [not win]
         - run_test_clangxx.bat      # [win]
@@ -182,7 +190,12 @@ outputs:
         # avoid conflicating activations
         - clang_win-64 <0.0a0
     test:
+      requires:
+        - cmake
+        - ninja
       files:
+        - cmake_test_c/
+        - cmake_test_cxx/
         - test.c
         - test.cpp
         - run_test_clang.bat
diff --git a/recipe/run_test_clang.bat b/recipe/run_test_clang.bat
index 83a2155..43ca376 100644
--- a/recipe/run_test_clang.bat
+++ b/recipe/run_test_clang.bat
@@ -10,3 +10,6 @@ if [%CC%] == [clang-cl.exe] (
     a.exe
     if %ERRORLEVEL% neq 0 exit 1
 )
+
+cmake -G Ninja cmake_test_c
+if %ERRORLEVEL% neq 0 exit 1
diff --git a/recipe/run_test_clang.sh b/recipe/run_test_clang.sh
index 5e19391..2a4d84e 100644
--- a/recipe/run_test_clang.sh
+++ b/recipe/run_test_clang.sh
@@ -5,3 +5,5 @@ echo "CONDA_BUILD_WINSDK: $CONDA_BUILD_WINSDK"
 echo "CI: $CI"
 $CC $CFLAGS test.c $LDFLAGS -v
 test -f a.exe
+
+cmake -G Ninja ./cmake_test_c
diff --git a/recipe/run_test_clangxx.bat b/recipe/run_test_clangxx.bat
index 828f982..164993e 100644
--- a/recipe/run_test_clangxx.bat
+++ b/recipe/run_test_clangxx.bat
@@ -10,3 +10,6 @@ if [%CXX%] == [clang-cl.exe] (
     a.exe
     if %ERRORLEVEL% neq 0 exit 1
 )
+
+cmake -G Ninja cmake_test_cxx
+if %ERRORLEVEL% neq 0 exit 1
diff --git a/recipe/run_test_clangxx.sh b/recipe/run_test_clangxx.sh
index c77d7b4..8cec142 100644
--- a/recipe/run_test_clangxx.sh
+++ b/recipe/run_test_clangxx.sh
@@ -5,3 +5,5 @@ echo "CONDA_BUILD_WINSDK: $CONDA_BUILD_WINSDK"
 echo "CI: $CI"
 $CXX $CXXFLAGS test.cpp $LDFLAGS -v
 test -f a.exe
+
+cmake -G Ninja ./cmake_test_cxx